Anti-theft means for fuel delivery truck



June 4, 1963 J. w. RENTSCHLER 3,092,289

ANTI-THEF T MEANS FOR FUEL DELIVERY TRUCK Filed Aug. 12, 1960 4Sheets-Sheet 1 NORMAL RECORDER SWITCH ($2322! $332) FIG. 2

TAKE'OFF SWITCH ATTEMPT To DRIVE PUMPING (STALL) RE DER S OH IGNITIONSYSTEM IGNITION SYSTEM (See figsIIBTIZ) (Seefigs.ll&|2)

l TAKE-OFF t- 5, r SWITCH INVENTOR JOHN WALT/5k RENTSGHLER BY V)?ATTORNEYS June 4, 1963 J. W. RENTSCHLER ANTI-THEFT MEANS FOR FUEL.DELIVERY TRUCK Filed Aug. 12. 1960 4 Sheets-Sheet 2 FIG. 5

INVENTOR JOHN WALTER RENTSCHLE'R BY Y ATTORNEYS June 4, 1963 J. w.RENTSCHLER 3,092,289

ANTI-THEFT MEANS FOR FUEL. DELIVERY TRUCK Filed Aug. 12, 1960 4Sheets-Sheet 3 52 i I 30 55-4 i 1 1 l, i l l t 52 I m0 l 9a; 8-8- Z :64\L as .96

F/ G. .9 F 6' /0 ff :2: k "4 F/G. /4 13a 1 26 INVENTOR f 0 ,3 JOHNWALTER RE/VTSGHLER ATTORNEYS June 4, 1963. J. w. RENTSCHLER 3,

ANTI-THEFT MEANS FOR FUEL DELIVERY TRUCK Filed Aug. 12, 1960 4Sheets-Sheet 4 GRAVITY DISPENSING SYSTEM RECORDER SWITCH SWITCH IGNITIONTEM IGNITION SYSTEM (See figs. I2 I (See figs. ll 81 I2) SWITCH PRESSUREOPERATED SWITCH RECORDER SWITCH TAKE'OFF SWITCH ELEGTRIC- POWER VEHICLER RDER I I I PM TAKE-OFF SWITCH INVENTOR JOHN mu. rm REIVTSOHLER BYE/M 9ATTORNEY United States Patent 3,092,289 ANTI-THEFT MEANS FOR FUELDELIVERY TRUCK John Walter Rentsclrler, 622.1 Monmouth Ave, Ventuor, NJ.Filed Aug. 12, 1960, Ser. No. 49,214 Claims. (ill. 222F-30) Thisinvention relates to an antitheft means for a fuel delivery truck. Morespecifically, this invention relates to means whereby a dishonest fueldelivery truck attend-ant is precluded from making a short delivery. Byshort delivery is meant a partial delivery to one customer, a seconddelivery to a favored customer and a billing of the first customer :forboth deliveries.

It is presently the practice in the delivery of fuel from a vehicle touse a saleslip impressed by a recorder associated with the meter of thevehicle. A typical recorder is disclosed in the U.S. Patent 2,204,922.which issued June 18, 1950, to W. F. Berck. Under this practice, therecorder is actuated twice for each delivery. It is first actuated torecord on the saleslip the reading of the meter at the commencement ofthe delivery. Later, it is actuated after delivery to impress on thesame saleslip the reading of the meter at that time. Means are providedto prevent removal .of the saleslip between impressions. It can be seenthat the amount of the delivery is the difference in the two readings.The saleslip is left with the customer and a duplicate copy is takenback to the fuel oil delivery oflice for billing purposes. I

It has been possible with arrangements in the past for a dishonestdelivery man to actuate the recorder at the beginning of the delivery,make a partial delivery to a first customer, and then to drive to afavored customer, dispense a second delivery, and then actuate therecorder for a second time. The saleslip would then be returned to thefirst customer who is then billed [for both deliveries.

Under the present invention, the dishonest attendant is precluded fromsuch practice. Any attempt he may make will be thwarted by his inabilityto drive the vehicle until the recorder is actuated for the second time.My invention includes means associated with the meter disabling thevehicle-propulsion means during the time between the recordings of themeter.

It is therefore an object of this invention to provide means disablingfor propulsion purposes theengine Off a fluid delivery truck until theend-:o f-delivery recording has been made on the saleslip.

It is a further object of the invention to provide for a fuel deliverytruck anti-theft means of foolproof and reliable nature. I

It is a'further object of this invention to provide for a incl deliverytruck antithefit means which may be readily sealed against tampering.

It is a further object of the invention to provide for a fuel deliverytruck anti-theft means which may :be easily checked to see if it isfunctioning properly.

It is a further object of this invention to provide tor a fuel deliverytruck anti-theft means which maybe incorporated into existingequipmentby an inexpensive, simple modification. A

This invention embodies other novel features, details of constructionand arrangement of parts which are hereinafiter set forth in thespecification and claims, and illustnated in the accompanying drawings,wherein:

FIGS. 2 through 4 inclusive are schematic diagrams of a circuit invarious conditions, said circuit embodying the invention;

pensed fiuid travels. a saleslip S. The mounting of the engine, pump,take- "re'c'order' between the tray 36 and the frame 32.

tray at this time is in the elevated position shown in Patented June 4,1963 FIG. 5 is a rear elevational view of a meter recorder embodying theinvention and having the rear portion of its housing removed;

[FIG 6 is a side elevational view of a meter recorder embodying theinvention iand having the rear portion of its housing removed;

FIG. 7 is a .firagmentary top plan view of a meter recorder embodyingthe invention and having the rear portion of its housing removed;

FIG. 8' is a perspective view of a switch and switch bracket as used ina meter recorder embodying the invention;

FIG. 9 is a fragmentary rear elevational view of a meter recorderembodying the invention;

FIG. 10 is a fragmentary side elevational view of a meter recorderembodying the invention and having part of the rear housing broken away;

FIG. 11 is a fragmentary front elevational view of an ignition coil asused in an embodiment of the invention;

FIG. 12 is a fragmentary side elevational view of an ignition coil asused in an embodiment of the invention;

FIG. 13 is a top plan view of pump take-off drive means as used in anembodiment of the invention;

FIG. 14 is a side elevational view of a pump take-off as used in anembodiment of the invention; and

FIGS. 15 through 18 are schematic diagrams of electrical circuitsembodying modified forms of the invention.

Briefly, the invention comprises in [combination of fluid dispensingvehicle having propulsion motor means, meter recording means adapted tobe provided with a saleslip to be impressed by said recording meansbefore and after the dispensation of fluid from the vehicle, and meansassociated with the meter recording device to deactivate said pnopulsionmotor means when an attempt is made to drive said vehicle during theperiod between the beforeand after-delivery recordings.

Referring more specifically to the drawings, a fuel delivery truckembodying the invention is designated 10 in FIG. 1. Mounted in the truckis the engine or motor propulsion means having its ignition coil, thefuel delivery pump, and take-off means connected between the engine andthe pump. Also mounted on the vehicle is a meter recorder driven by ameter through which the dis- The recorder is adapted to receive off, andmeter recorder are well known in the art.

The meter recorder is shown in FIGS. 5, 6, and 7, and is designated 30.It may comprise a stationary frame 32 mounted in a vertical position andhaving a plurality of rearwardly directed studs 34. A saleslipsupporting tray 36 is provided with a plurality of slots receiving thestuds 34 respectively whereby the tray is adapted to reciprocatevertically with respect to the frame 32. Mounted in the frame by meanswell known in the art are type segments 40 operatively connected to themeter. These segments are exposed through a window 42 in the tray.

A block 44 extends rearward at the lower end of the frame 32 andanchorsone end of a movable arm 46. The upper end of the arm is provided with aroller platen 48. The arm is adapted to oscillate so thatthe rollerplaten rolls over the faces of the type segments 40. It

will be noted that the tray carries a punch lever 50 having a sharp endadapted to extend through a slot in the tray to retain the saleslip. Thetray 36, the moving platen 48, and the punch lever 50 are all driven bya crank 52 disposed for operation on the outside of the housing. a i

In use, prior to delivery the saleslip is inserted in the The brokenlines in FIG. 5 and the moving platen 48 in the leftward position alsoshown in broken lines. The atamazes tendant then turns the crank 52through its first cycle. The punch lever 50 driven by the crank piercesthe saleslip, holding it from removal. The moving platen 48 Swings overthe type segments 40, impressing the before delivery reading on theslip, and assumes the position shown in full lines. The tray 36 thenlowers to the position shown in full lines, carrying the slip down withit.

After the dispensation of fluid, the attendant turns the crank 52 in areverse direction. The moving platen 48 swings to the leftward positionshown in dotted lines passing over the type segments 40 disposed intheir new reading and recording the reading on the slip. The tray 36moves to the original elevated position, and the punch lever 50 releasesthe saleslip for removal from the recorder.

In the preferred embodiment of the invention a switch 54 is mountedrigidly against the frame 32 of the recorder. The switch best suited forthis purpose has been found to be of the micro-switch type having aplunger actuator 56 of short travel and being structurally designed sothat an electric circuit connected thereto is normally held open byspring means within the switch housing. The circuit may be closed bydepression of the plunger against the force of the spring.

As shown in FIG. 5, the switch is mounted against the frame 32 in such aposition that the plunger 56 is directed upwardly and that the housingof the switch is spaced outward from the recorder so that it does notinterfere with the movement of the tray 36. It has been found that themounting of the switch in a rigid and proper placement is extremelyimportant. As is best shown in FIG. 8, the mounting means for themicroswitch comprises a bracket 58 having a sturdy sheet metal housingfeaturing three intersecting planar walls 58a, 58b, 580. The presence ofthese three intersecting Walls has been found effective because itcreates a box-like structure of substantial strength. The upperhorizontal wall 58a of this structure is firmly fixed in position and itis to this wall that the switch 54 is secured. It is important that thistop wall 58a be firmly fixed because the pressure in actuating theswitch is in a downward direction and were the wall not fixed suchpressure would bend the wall and work the switch out of position. Thetop wall 58a of the switch bracket is formed preferably with a pair oftapped apertures which threadedly receive mounting bolts 60 extending upthrough the switch from underneath. These bolts urge the top wall ofswitch 54 firmly against the underside of the top wall 58a of thebracket. If it is desired to lower slightly the vertical position of theswitch, shims may be disposed between the top wall 58a of the bracketand the switch 54.

Extending perpendicular from the partial vertical wall 580 of thebracket and disposed in a plane parallel to the movement of the switchplunger is a fiat elongate mounting arm 62. The arm is of considerablewidth and is provided with a pair of spaced apertures through whichextend mounting bolts 64 which engage in tapped holes in the rear faceof the block 44 to hold the bracket 58 securely.

To effect movement of the switch plunger 56, upon the movement of thesaleslip tray, there is provided an L-shaped co-acting means 66. Thismeans comprises a fiat elongate vertical leg 68 which is secured by apair of short mounting bolts 70 against the saleslip tray in an areaabove the switch plunger '56. Directed perpendicular from the lower endof this vertical leg is a shorter horizontally disposed arm 72 (see FIG.6). The

co-acting means is fashioned from sturdy strip material which is notlikely to flex or bend.

Reviewing the operation of the recorder once more. with the switch andits co-acting means in mind, it will 4 plunger closes the electriccircuit in which the switch is associated. The circuit will, of course,remain closed until the arm 72 raises from the plunger as the trayreturns to its initial elevated position after the end-of-deliveryprinting.

It will be understood that the switch 54 and arm 72 must be positionedrelatively so that the switch cannot be released to return to itselectrically open disposition until the end-of-delivery printing ismade. This is one reason why the positioning of the switch is critical.

Circuit and General Operation In the preferred embodiment as diagramrnedin FIG- URE 2, the recorder switch, above described, is in serieselectrically with a pump take-off switch. The pump takeoff switch ismounted adjacent the pump power take-off and is arranged to beelectrically open when the take-off is engaged as will be explained.These two switches are electrically in series circuit between theignition system and the metal frame of the vehicle so that when therecorder switch is electrically closed (see FIG. 4) and the take-offswitch is electrically closed, the ignition system is grounded,shot-ting out the spark plugs and making the engine inoperative. FIGURE3 discloses the disposition of the two switches during the dispensingwherein the recorder switch is closed and the pump take-off switch iselectrically open because the take-off is engaged. Because one of thesetwo switches is open, the engine will continue to operate.

With respect to the arrangement shown in FIGURES 2, 3 and 4, forexample, the operator has parked his oil delivery truck and is ready tomake adelivery. The power take-off is engaged and switch lever 1 36, seeFIG. 13, pivots the take-oil switch housed within box 132 toelectrically open position. A saleslip is inserted into the tray 36, seeFIG. 5, of the recorder, the tray '36 being in the up position isindicated by broken line in FIG. 5. The attendant then turns the crank52 through is first cycle. The punch lever 50 driven by the crankpierces the saleslip; holding it from removal. The moving platen 48swings from the broken line position over the type segments 40impressing the before-delivery reading on the slip. The tray 36 carryingthe saleslip has now lowered to the position shown in full lines and arm72 has moved down with the tray to push the actuator 56 of the recorderswitch 58 down to electrically closed position as shown in FIGS. 3 and4. If a partial delivery is made and saleslip is left in the recorderwith the tray the down position and unmoved and it is desired to movethe truck, the power take-off must be disengaged. 1f the power take-offis disengaged, the am 136 will swing and rotate the power take-citswitch in the box 132, see

- FIG. 13, and that switch will close. This will complete a be notedthat after the before-delivery printing the tray 36 lowers to theposition shown in solid lines in FIG. 5. In doing so, it advances arm 72down to engage and depress the switch plunger 56. Such depression of thecircuit from the ground lead terminal of the ignition coil of theignition system as shown in FIG. 4 and the coil will be continuouslyconnected to ground on the frame of the truck and the propulsion motorof the truck will stop.

A situation can be conceived wherein the dishonest attendant determinedto make a short delivery and aware of the circuit employed by theinvention, will attempt to drive the vehicle during the time betweenprintings of the recorder while the take-off is engaged. Because thetakeoff switch is open, the engine will operate. This attempt at theftwill, however, be evidenced by the destruction of the delivery pumpwhich is not designed to withstand operation at the high speeds ofrotation necessary in driving. Thus, to drive the truck withoutdestroying the pum it is first necessary to disengage the delivery pumptake-0E. The disengagement closes the pump take-cit switch.

Sealing of the System easily adapted to such protection. As shown inFIG- URES 9 and ,10 the electric leads 80-812 to the recorder switch areindividually shielded and penetrate the recorder housing 84 intamperproof fashion. In the preferred embodiment, the rear wall of therecorder housing 84 has adjacent the micro-switch 54 an opening which isprovided with a cover plate 86 bolted in place on the rear of thehousing. The bolts 88 have their shanks directed outward so that nutsare exposed from the outside of the housing. Each bolt has an apertureadjacent its nut and intermediate the nut and the end of its shank. Theplate 86 is formed with a pair of spaced apertures each of which mayreceive an elbow fitting 90 having a reduced and threaded end, each endbeing secured in the plate 86 by a nut 92 within the housing.- The nutthreadedly engages the threaded end of the elbow and clamps it againstthe plate 86. Each of the elbow fittings is provided adjacent its distalend with an encompassing C-shaped clamp 94 having a bolt 96 and nutdrawing its ends together. The bolts of the clamps have apertures intheir shanks adjacent the nut and between the nut and the end of theshank opposite the head. A sealing wire 98 extends through all of theapertures in the bolt shanks, and the ends of the sealing wire arejoined together by a lead seal 100. Alternatively, the nuts also may beapertured and the sealing wire extend through each bolt and nut as iswell known in the art. Thus, it is impossible for one to tamper with theshielded cables 80*, 82 leading to the recorder switch without breakingthe seal 100. The recorder housing 84, of course, is sealed closed inthe customary fashion.

FIGURES 11 and 12 disclose the means by which the shielded cable isconnected to the ignition system coil 102 in tamperproo-f fashion. Theshield cable lead 80 extending from the recorder switch is connected toone or the coil terminals 104. A clamp 106 completely encompasses theside wall of the coil and extends in clamping fashion over the shieldedcable. The clamp 106 is drawn tight by a bolt 108 and nut, the bolthaving an aperture in its shank adjacent the nut and between the nut andthe end of the shank. After the clamp is applied and the nut taken up, asealing wire 110 is passed through the aperture. To the ends of the wireis affixed a lead seal 11-2. Extending upwardly from the encompassingclamp is a rigid hood member 114 which covers the terminal of the coiland prevents access thereto. It does not, however, interfere with thenormal ignition system connections to the coil terminals (not shown). Asshown in FIGURE 12, the hood terminates upwardly in an invertedboxshaped member, the walls of which are spaced from the terminal 104 toavoid short circuiting.

It is thus impossible for one to remove the shielded cable 80 from itsconnection to the coil terminal 104 without breaking the seal 112 andremoving the coil-encompassing clamp 106.

The mounting of the pump take-off switch is disclosed in FIGS. 13 and 14wherein the pump take-oil housing is designated 120. It comprises adome-shaped member 122 having extending therefrom a mounting flange 124by which the unit is mounted on the vehicle transmission. The housingmounts an engagement actuator rod 126 operated by a conventional controllinkage which is not shown. Axial movement of the actuator rod 126engages or disengages the gears within the housing. The take-off driveshaft 128 extends out of the housing 120 below the actuator rod 126. Onthe flange 124 is mounted an upstanding leg 130. To the upper end ofthis leg is rigidly mounted a cup-shaped switch box 132 having a centralupstanding switch stern 134 adapted in rotation to operate a switchwithin the box. The stem 134 has secured to it a lever 136 which extendsout and is loosely connected to the take-off engagement actuator rod126. One of the terminals of the switch within the cupshaped box isgrounded to the frame of the box 132 and hence to the metal frame of thevehicle. The other terminal is connected to the end of the shieldedcable 82 from the recorder switch which extends through an opening inthe cylindrical box 132. A C-shaped clamp 138 encompasses the box andholds its two hanged similar halves together. This clamp is drawntogether by a bolt 140 and nut similar to the one on the clamp used inconnection with the coil 102 above. As shown, the bolt is aperturedadjacent the nut and a sealing wire passing through the opening in thebolt and a lead seal preclude tampering. Cable 82 extends in an openingin the bottom of the lower half of the box. The opening has an outwardlyextending flange therea'bout which receives another C-shaped clamp drawnup about cable 82 by bolt 142 having a nut and being apertured andsealed as bolt 140.

Thus as the linkage which operates the take-01f actuator reciprocates,it oscillates the switch lever 136 to turn on and off the switch withinthe box 132. As indicated above, the switch is normally in theelectrically closed disposition, but when the take-cit gears areengaged, the switch is in the electrically open disposition.

Alternative Circuits Involving the Invention Other embodiments of thecircuit involving the invention are shown in FIGURES 15-18. FIGURE 15shows schematically a circuit embodying the invention as it would beadapted to a gravity-dispensing system wherein no driven pump means areused. In such a system, simply, the recorder switch is connected betweenthe ignition system and the metal frame of the vehicle or other groundso that the ignition is shorted and the engine may not operate Ibetweenthe initial and final printing of the recorder. I

FIGURE 16 shows a modified form of a circuit embodying the inventionwherein a pressure switch is employed. The pressuresensitive actuator ofthis switch is connected to the outlet of the pump. This pressure switchis disposed in a parallel electrical circuit with the pump take-01fswitch. Employing such an arrangement, if an attempt is made to drivethe vehicle away between the recordings and with the take-oil switch inthe open position, the pressure built up by the pump will close thepressure switch to short out the ignition system. In the preferredcircuit embodying the invention, shown in FIG- URES 2, 3 and 4, no suchpressure switch is used. It has been found that the risk of destroyingthe pump by excess speed is enough to deter such an attempt, asexplained above. However, in the alternative circuit embodying theinvention as shown in FIGURE 16 this extra precaution is incorporated.

FIGURE 17 is a schematic diagram of a circuit by which the invention maybe embodied in a diesel-powered vehicle. This diagram discloses therecorder switch and the pump take-off switch in series with a source ofelectric power P. A solenoid-operated valve V in the engine fuel linecompletes the circuit. Thus when both the recorder switch and thetake-0d switch are closed, the fuel line will be closed, cutting off thesupply of fuel to the vehicle.

FIGURE 18 discloses a circuit embodying the invention in anelectric-powered vehicle. In this embodiment, the recorder and thetake-cit switches are again in series with a power supply and asolenoid-operated means. The solenoid operated means in this case is anormally closed power switch S, which, when both the recorder and thetake-off switch are closed, is driven to electrically open disposition.The opening of the power switch opens the propulsion circuit of theelectric-powered Vehicle to cut off its motor.

While this invention has been shown in but only a few forms, it will beobvious to those skilled in the art that it is not so limited but thatit is susceptible of various changes and modifications without departingfrom the scope of the claimed invention.

-I claim:

1. Apparatus for preventing misdelivery of fluid in a fluid dispensingvehicle having a motor propulsion mechanism including an ignitionsystem, -a before and after delivery slip printing and recording meterand a power take olf device from said propulsion mechanism for driving afluid dispensing pump, comprising in combination, an electrical normallyopen switch attached to said meter for actuation thereby to closedposition during the time between before and after delivery slipprinting, an electrical normally open switch attached adjacent the powertake 101T device for actuation to open position when said power take offdevice is operative, an electrical common conductor connecting oneterminal of each of said switches, an electrical conductor connectingthe other terminal of one of said switches with aground on said vehicleand an electrical conductor connecting the other terminal of the otherof said switches and a portion of said ignition system whereby toprovide a series circuit to the vehicle ground to disable said ignitionsystem and motor propulsion mechanismsho-uld misclosure take place ofsaid switch operated by the power take off while said switch operated bythe meter is closed.

2. Apparatus for preventing misdelivery of fluid in a fluid dispensingvehicle according to claim 1 including a fluid pressure normally openswitch connected to the discharge side of the fluid delivery pump foractuation to closed position on excess pressure from the pump, anelectrical conductor connecting one terminal of the pressure switch to aground on said vehicle and an electrical connector connecting the otherterminal of said pressure switch and said common electrical conductorelectrically connecting said first two mentioned switches wherebyattempted driving of said vehicle with said switch actuated by the meterclosed and the power take ofi'operative creates excess pressure deliveryby said pump to close said pressure switch to complete a circuit fromthe ignition system to ground .to disable the same and said vehiclemotor propulsion mechanism.

3. An apparatus for preventing misdelivery of fluid in a fluiddispensing vehicle according to claim 1 wherein said electricalconductors are encased in armored sheaths and all connections are sealedin antiatamper means.

4. Apparatus for preventing misdelivery of fluid in a fluid dispensingvehicle having a motor propulsion mechanism including an ignitionsystem, a before and after delivery slip printing and recording meterand a power take off device from said propulsion mechanism for driving afluid dispensing pump, comprising in combination, an electrical normallyopen switch attached to said meter for actuation thereby to closedposition during the time between before and after delivery slipprinting, a fluid pressure normally open switch connected to thedischarge side of the fluid delivery pump for actuation to closedposition on excess pressure from the pump, an electrical commonconductor connecting one terminal of each of said switches, anelectrical conductor connecting the other terminal of one of saidswitches with a ground on said vehicle and an electrical conductorconnecting the other terminal of the other of said switches and aportion of said ignition system, whereby to provide a series circuit tothe References Cited in the file of this patent UNITED STATES PATENTS1,172,403 Sulsona Feb. 22, 1916 2,138,287 Willers Nov. 2-9, 19382,172,116 Warren Sept. 5, 1939 2,242,142 Parker May 13, 1941 2,287,199Schick June 23, 1942 2,293,333 Eickmeyer Aug. 18, 1942 2,428,751 FouldsOct. 7, 1947 2,617,901 Madsen Nov. 11, 1952 2,652,125 Dewhirst Sept. 15,1953 2,707,577 Trotter et al. May 3, 1955 2,731,100 'Butler Jan. 17,1956 2,768,700 Miller Oct. 30, 1956 2,847,023 Hansen et 'al. Aug. 12,1958 2,928,488. Stephen Mar. 15, 1960 2,946,485 Durner July 26, 1960

1. APPARATUS FOR PREVENTING MISDELIVERY OF FLUID IN A FLUID DISPENSINGVEHICLE HAVING A MOTOR PROPULSION MECHANISM INCLUDING AN IGNITIONSYSTEM, A BEFORE AND AFTER DELIVERY SLIP PRINTING AND RECORDING METERAND A POWER TAKE OFF DEVICE FROM SAID PROPULSION MECHANISM FOR DRIVING AFLUID DISPENSING PUMP, COMPRISING IN COMBINATION, AN ELECTRICAL NORMALLYOPEN SWITCH ATTACHED TO SAID METER FOR ACTUATION THEREBY TO CLOSEDPOSITION DURING THE TIME BETWEEN BEFORE AND AFTER DELIVERY SLIPPRINTING, AN ELECTRICAL NORMALLY OPEN SWITCH ATTACHED ADJACENT THE POWERTAKE OFF DEVICE FOR ACTUATION TO OPEN POSITION WHEN SAID POWER TAKE OFFDEVICE IS OPERATIVE, AN ELECTRICAL COMMON CONDUCTOR CONNECTING ONETERMINAL OF EACH OF SAID SWITCHES, AN ELECTRICAL CONDUCTOR CONNECTINGTHE OTHER TERMINAL OF ONE OF SAID SWITCHES AND A PORTION OF HICLE AND ANELECTRICAL CONDUCTOR CONNECTING THE OTHER TERMINAL OF THE OTHER OF SAIDSWITCHES AND A PORTION OF SAID IGNITION SYSTEM WHEREBY TO PROVIDE ASERIES CIRCUIT TO THE VEHICLE GROUND TO DISABLE SAID IGNITION SYSTEM ANDMOTOR PROPULSION MECHANISM SHOULD MISCLOSURE TAKE PLACE OF SAID SWITCHOPERATED BY THE POWER TAKE OFF WHILE SAID SWITCH OPERATED BY THE METERIS CLOSED.